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Home >> Volvo >> 1998 >> S70 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P1505/EFI 223, P1506/EFI 223 & DTC P1507/EFI 245, P1508/EFI 245 >> Diagnosis

DTC P1505/EFI 223, P1506/EFI 223 & DTC P1507/EFI 245, P1508/EFI 245: Diagnosis

  1. If fault is permanent and signal is too high, go to next step. If fault is permanent and signal is too low, go to step  3. If fault is intermittent and signal is too high, go to step  6. If fault is intermittent and signal is too low, go to step  7. If fault is permanent and signal is missing, go to step  9. If fault is intermittent and signal is missing, check all connectors for good terminal contact. Repair as necessary.
  2. Turn ignition off. Disconnect IAC valve. Turn ignition on. Measure voltage between ground and IAC valve connector terminal No. 3 (DTC 223) or terminal No. 1 (DTC 245). If voltage is less than one volt, replace valve. If voltage is more than one volt on DTC 223, check wiring between IAC valve connector terminal No. 3 and ECM connector terminal A11 for a short circuit to voltage. On DTC 245, if voltage is more than one volt, check wiring between IAC valve connector terminal No. 1 and ECM connector terminal A25 for a short circuit to voltage.
  3. If fault is permanent and signal is too low, turn ignition off. Disconnect IAC valve. Turn ignition on. Measure voltage between IAC valve connector terminal No. 2 and ground. If battery voltage is present, go to next step. If battery voltage is not present, check wiring between main relay connector terminal No. 3 and IAC valve connector terminal No. 2 for an open circuit. If there is an open circuit in voltage lead, both DTCs 223 and 245 will be set.
  4. Turn ignition off. Wait approximately 2 minutes. Disconnect IAC valve connector. Connect an DVOM between IAC valve connector terminals No. 1 and 3. If DVOM reads 20,000-40,000 ohms, go to next step. If DVOM reads infinite resistance, check wiring between IAC valve terminal No. 3 and ECM connector terminal A11 for a short to ground. Repair as necessary. If DVOM shows approximately zero ohms on DTC 223, check wiring between IAC valve connector terminal No. 3 and ECM connector terminal A11 for a short to wiring between IAC valve connector terminal No. 1 and ECM connector terminal A25. Repair as necessary.
  5. Turn ignition off. Disconnect IAC valve. Connect DVOM between IAC valve connector terminals No. 1 and 2, then between terminals No. 2 and 3. If DVOM reads 9-14 ohms in both cases, cause of DTC is poor contact in IAC valve connector. Repair as necessary. If DVOM does not read 9-14 ohms in both cases, retest using new IAC valve.
  6. If fault is intermittent and signal is too high on DTC 223, check wiring between IAC valve connector terminal No. 3 and ECM connector terminal A11 for an intermittent short to voltage or intermittent short circuit to coil signal voltage. On DTC 245, check wiring between IAC valve connector terminal No. 1 and ECM connector terminal A25 for an intermittent short to voltage or intermittent short circuit to coil signal voltage.
  7. If fault is intermittent and signal is too low on DTC 245, go to next step. On DTC 223, check IAC valve and ECM connectors for contact resistance and oxidation. Repair as necessary. Check wiring between main relay connector terminal No. 3 and IAC valve connector terminal No. 2 for an intermittent open circuit. Also check wiring between IAC valve connector terminal No. 3 and ECM connector terminal A11 for an intermittent open circuit or short circuit to ground.
  8. On DTC 245, check IAC valve and ECM connectors for contact resistance and oxidation. Repair as necessary. Check wiring between main relay connector terminal No. 3 and IAC valve connector terminal No. 2 for an intermittent open circuit. Also check wiring between IAC valve connector terminal No. 1 and ECM connector terminal A25 for an intermittent open circuit or short circuit to ground.
  9. If fault is permanent and signal is missing, turn ignition off. Wait approximately 2 minutes. Disconnect IAC valve. Connect DVOM between ground and IAC valve connector terminal No. 3. If DVOM does not read 10,000-20,00 ohms, go to next step. If DVOM reads 10,000-20,00 ohms, measure resistance between IAC valve connector terminals No. 1 and 2, then between terminals No. 2 and 3. If DVOM reads 9-14 ohms in both cases, DTC was caused by poor terminal contact at IAC valve connector. If DVOM does not read 9-14 ohms, replace IAC valve.
  10. Check IAC valve connector terminals and ECM connector terminals for poor terminal contact. Repair as necessary. Repeat test. If DVOM now reads 10,000-20,00 ohms, problem was poor terminal contact. If DVOM does not read 10-20 k/ohms, check wiring between IAC valve terminal No. 3 and ECM connector terminal A11 for an open circuit.
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